Preheating shall be carried out for carbon and lowalloy steel welding where required. Preheating temperature shall be kept uniform from the start to the end of welding.
在进行碳钢及低合金钢的焊接时应进行预热。预热温度在焊接开始到结束期间应保持均衡。
2
The effects of opening flask temperature and cooling rate on low and high temperature age-hardening alloy casting are tested and studied.
试验研究了开箱温度和冷却速度对低、高温时效型合金时效硬化效果的影响。
3
The lowtemperature toughness of lowtemperature steel can be improved effectively by means of adjusting alloy ingredients and modifying heat-treatment regime.